Birth control pills contains a combination of female hormones that prevent pregnancy by stopping ovulation, the release of an egg from the ovaries.

Ortho Tri-Cyclen contains a combination of female hormones that prevents ovulation or release of eggs from the ovary. It is a popular contraception pill that also causes changes in your cervical mucus and uterine lining, making it difficult for the sperm to reach the uterus.

The rhythm method, also called the fertility awareness method, is a form of pregnancy prevention where couples calculate a woman's fertile time using a calendar and fertility signals, like cervical mucus and date of her last menstrual period.

Many women choose oral contraception because it effectively prevents unplanned conceptions and otherwise fits well with their lives. Some women do experience side effects, including elevated liver enzymes.

The time it takes to become pregnant after discontinuing birth control pills varies.

Birth control is available in a variety of methods, from natural family planning to an intrauterine device, condoms, pills, rings and patches. Each method has advantages and disadvantages in terms of convenience, potential side effects and pregnancy prevention.

Depo-Provera (medroxyprogesterone acetate) is an injectible form of birth control for women that prevents pregnancy by stopping the ovaries from releasing eggs. This medication is a man-made (synthetic) hormone that is similar to the naturally-occurring hormone called progesterone.

Emergency contraception pills, called EC and often referred to as the morning after pill, are hormone pills designed to prevent pregnancy. EC pills stop pregnancy in different ways, depending on where a woman is in her menstrual cycle when taken.

Approximately 50 percent of pregnancies in the United States are unintended, according to a February 2014 report in the American Journal of Public Health. Plan B is one of several methods of emergency contraception to prevent pregnancy after unprotected sex or a birth control failure.

Amenorrhea can be a scary experience for some women and welcomed by others. This is a normal event that happens in a woman's life due to pregnancy or menopause. At times in the menstrual cycle, women may experience cycles of amenorrhea.

All sexually active adults must consider family planning issues. According to the World Health Organization, family planning is not just about preventing pregnancy, but also about timing conception so that every baby is wanted and planned.

A vasectomy makes a man permanently unable to impregnate a woman. It is typically very effective, with only 15 out of 10,000 couples getting pregnant the first year after the vasectomy is performed, according to the American Academy of Family Physicians.